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1,1-Dimethylhydrazine

Product Name
1,1-Dimethylhydrazine
CAS No.
57-14-7
Chemical Name
1,1-Dimethylhydrazine
Synonyms
UDMH;Dimazin;Dimazine;(CH3)2NNH2;1,1-dimethyl;Dimethylhydrazine;u-Dimethylhydrazine;rcrawastenumberu098;n,n-dimetilidrazina;1,1-Dimethyldrazine
CBNumber
CB0437549
Molecular Formula
C2H8N2
Formula Weight
60.1
MOL File
57-14-7.mol
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1,1-Dimethylhydrazine Property

Melting point:
-57.2 °C
Boiling point:
60-62 °C(lit.)
Density 
0.79 g/mL at 20 °C(lit.)
vapor density 
1.94 (vs air)
vapor pressure 
103 mm Hg ( 20 °C)
refractive index 
n20/D 1.4075(lit.)
Flash point:
34 °F
storage temp. 
2-8°C
solubility 
Miscible with alcohol, N,N-dimethylformamide, ether, hydrocarbons (Windholz et al., 1983), and many other polar solvents.
form 
Colorless liquid
pka
8.19±0.18(Predicted)
explosive limit
95%
Water Solubility 
miscible
Sensitive 
Hygroscopic
Merck 
14,3247
BRN 
605261
Henry's Law Constant
2.45(x 10-9 atm?m3/mol) at 25 °C (quoted, Mercer et al., 1990)
Exposure limits
TLV-TWA skin 0.5 ppm (1.0 mg/m3 ) (ACGIH, MSHA, and OSHA); carcinogenicity: Animal Sufficient Evidence (IARC), Suspected Carcinogen (ACGIH).
CAS DataBase Reference
57-14-7(CAS DataBase Reference)
IARC
2B (Vol. 4, Sup 7, 71) 1999
NIST Chemistry Reference
Hydrazine, 1,1-dimethyl-(57-14-7)
EPA Substance Registry System
1,1-Dimethylhydrazine (57-14-7)
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Safety

Hazard Codes 
F,T,N
Risk Statements 
45-11-23/25-34-51/53-37-23/24/25
Safety Statements 
53-45-61-36/37
RIDADR 
UN 1163 6.1/PG 1
WGK Germany 
3
RTECS 
MV2450000
Autoignition Temperature
478 °F
HazardClass 
6.1
PackingGroup 
I
HS Code 
29280090
Hazardous Substances Data
57-14-7(Hazardous Substances Data)
Toxicity
Acute oral LD50 for rats 122 mg/kg, mice 265 mg/kg (quoted, RTECS, 1985).
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H225Highly Flammable liquid and vapour

H314Causes severe skin burns and eye damage

H335May cause respiratory irritation

H350May cause cancer

H411Toxic to aquatic life with long lasting effects

Precautionary statements

P201Obtain special instructions before use.

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
D161608
Product name
N,N-Dimethylhydrazine
Purity
98%
Packaging
5g
Price
$36.7
Updated
2021/03/22
Sigma-Aldrich
Product number
D161608
Product name
N,N-Dimethylhydrazine
Purity
98%
Packaging
100g
Price
$81.5
Updated
2021/03/22
Sigma-Aldrich
Product number
D161608
Product name
N,N-Dimethylhydrazine
Purity
98%
Packaging
500g
Price
$280
Updated
2021/03/22
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1,1-Dimethylhydrazine Chemical Properties,Usage,Production

Chemical Properties

1,1-Dimethylhydrazine is a colorless, flammable, hygroscopic liquid that gradually turns yellow on contact with air and is miscible with water. 1,1-Dimethylhydrazine is primar- ily used as a high-energy fuel in military applications, as a rocket propellant and fuel for thrusters, and small electrical power-generating units. 1,1-Dimethylhydrazine is also used in the manufacture of a plant growth regulator, in chemical synthesis, in photographic chemicals, as a stabilizer for fuel additives, and as an absorbent for acid gases. Exposure to 1,1-dimethylhydrazine usually occurs at the workplace during use and handling of the chemical substance. No information is available on the carcinogenic effects of 1,1-dimethylhydrazine in humans. Carcinogenic effects were observed in mice and rats exposed to 1,1-dimethylhydrazine by inhalation, but the carcinogenicity could not be defi nitively attributed to 1,1-dimethylhydrazine because of the presence of contaminants in the study. The US EPA has not classifi ed 1,1-dimethylhydrazine for potential carcinogenicity, while the IARC has classifi ed 1,1-dimethylhydrazine as Group 2B, meaning a possible human carcinogen.

Physical properties

Clear, colorless fuming liquid with an amine-like odor. Turns yellow on exposure to air. Odor detection threshold concentrations ranged from 6.1 to 14 ppmv (Jacobson et al., 1955).

Uses

1,1-Dimethylhydrazine is used in rocket fuel.

Uses

Base in rocket fuel formulations; intermediate in organic synthesis

Definition

ChEBI: A member of the class of hydrazines that is hydrazine substituted by two methyl groups at position 1.

General Description

A clear colorless liquid with an ammonia-like odor. Flash point 0°F. Corrosive to the skin. Less dense than water and soluble in water. Vapors are heavier than air and very toxic by inhalation, attacking the eyes and respiratory system. Prolonged exposure of containers to heat may result in their violent rupturing and rocketing due to decomposition. Generates toxic oxides of nitrogen when burned. Vapors may travel to a source of ignition and a flame can flashback to the source of vapors. Used as a rocket propellant and to make other chemicals.

Air & Water Reactions

Highly flammable over a wide range of vapor concentrations. May ignite spontaneously when spread on a large surface exposed to the air. [Def. Res. and Eng., pp 299-300(1963)]. Dissolves and slowly decomposes in water.

Reactivity Profile

1,1-Dimethylhydrazine is a powerful reducing agent. Ignition can occur on contact with oxidizing agents such hydrogen peroxide and fuming nitric acid, [Haz. Chem. Data(1966)]. Also reacts as a base to neutralize acids in exothermic reactions.

Health Hazard

1,1-Dimethylhydrazine exhibits high acute toxicity as a result of exposure by all routes. Death or permanent injury may result after very short exposure to small quantities. Chronic exposure may cause pneumonia, liver damage, and kidney damage.

Health Hazard

The vapors of this compound are irritating tothe eyes, nose, and throat. The liquid is corrosive to the skin. The toxic properties aresimilar to those of 1,1-dimethylhydrazine.Exposure to 280 ppm for 4 hours was fatalto rats. The oral LD50 value in th.

Fire Hazard

Vapor may explode if ignited in an enclosed area. Vapors may travel to a source of ignition and flashback. Runoff to sewer may create fire or explosion hazard. When 1,1-Dimethylhydrazine decomposes, 1,1-Dimethylhydrazine gives off toxic nitrogen compound fumes. Dissolves, swells, and disintegrates many plastics. Dangerous when exposed to heat, flame, or oxidizers. Hazardous polymerization may not occur.

Safety Profile

Confirmed carcinogen with experimental carcinogenic, tumorigenic, and teratogenic data. Other experimental reproductive effects. Poison byingestion, intraperitoneal, intravenous, and intracerebral routes. Moderately toxic by inhalation and skin contact. Human mutation data reported. A plant growth control agent. Corrosive. A powerful reducing agent. A dangerous fire hazard. It is hypergolic with many oxidants (e.g., dinitrogen tetroxide, hydrogen peroxide, and nitric acid). Dangerous when exposed to heat, flame, or oxidizers; can react vigorously with oxidning materials such as air, fuming HNO3, (HNO3 + N2O4), NO. A high-energy propellant for liquid-fueled rockets. To fight fire, use alcohol foam, CO2, dry chemical. When heated to decomposition it emits highly toxic fumes of NOx. See also HYDRAZINE.

Carcinogenicity

1,1-Dimethylhydrazine is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.

Environmental Fate

Chemical/Physical. Releases toxic nitrogen oxides when heated to decomposition (Sax and Lewis, 1987). Ignites spontaneously in air or in contact with hydrogen peroxide, nitric acid, or other oxidizers (Patnaik, 1992).
N-Nitrosodimethylamine was the major product of ozonation of 1,1-dimethylhydrazine in the dark. Hydrogen peroxide, methyl hydroperoxide, and methyl diazene were also identified (HSDB, 1989).

Purification Methods

Fractionally distil the hydrazine through a 4-ft column packed with glass helices. Precipitate it as its oxalate from diethyl ether solution. After crystallising from 95% EtOH, the salt is decomposed with aqueous saturated NaOH, and the free base is distilled, dried over BaO and redistilled [McBride & Kruse J Am Chem Soc 79 572 1957]. Distillation and storage should be under nitrogen. [Beilstein 4 IV 3322.]

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1,1-Dimethylhydrazine Suppliers

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